Orbital reconstruction and interface ferromagnetism in self-assembled nanosheet superlattices

Minoru Osada; Takayoshi Sasaki; Kanta Ono; Yoshinori Kotani; Shigenori Ueda; Keisuke Kobayashi

doi:10.1021/nn200835v

Orbital reconstruction and interface ferromagnetism in self-assembled nanosheet superlattices

Minoru Osada^*, Takayoshi Sasaki, Kanta Ono, Yoshinori Kotani, Shigenori Ueda, Keisuke Kobayashi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

40 Citations (Scopus)

Abstract

We have investigated the interface electronic states in self-assembled (Ti_0.8Co_0.2O₂/Ti_0.6Fe _0.4O₂)_n superlattices by X-ray photoelectron spectroscopy. A charge of about -0.3 electron is transferred from Fe to Co ions across the interface and induces a major reconstruction of the orbital occupation at the interfacial (Ti_0.8Co_0.2O ₂/Ti_0.6Fe_0.4O₂) layers. Supported by first-principles calculations, the Co³⁺ state is partially occupied at the interface by superlattice formation, and this new magnetic state directly influences the coupling between Ti_0.8Co_0.2O₂ and Ti_0.6Fe_0.4O₂ nanosheets. These data indicate that the orbital reconstruction is indeed realized by the interface charge transfer between Co and Fe ions in the adjoined nanosheets, and the generic feature of engineered interfaces can be extended to self-assembled superlattices of oxide nanosheets.

Original language	English
Pages (from-to)	6871-6879
Number of pages	9
Journal	ACS Nano
Volume	5
Issue number	9
DOIs	https://doi.org/10.1021/nn200835v
Publication status	Published - 2011 Sept 27
Externally published	Yes

Keywords

ferromagnetic nanosheets
interface ferromagnetism
layer-by-layer assembly
orbital reconstruction
X-ray photoemission spectroscopy

ASJC Scopus subject areas

Engineering(all)
Materials Science(all)
Physics and Astronomy(all)

Access to Document

10.1021/nn200835v

Cite this

@article{309a2ace414247ca821e9894b8e133cc,

title = "Orbital reconstruction and interface ferromagnetism in self-assembled nanosheet superlattices",

abstract = "We have investigated the interface electronic states in self-assembled (Ti0.8Co0.2O2/Ti0.6Fe 0.4O2)n superlattices by X-ray photoelectron spectroscopy. A charge of about -0.3 electron is transferred from Fe to Co ions across the interface and induces a major reconstruction of the orbital occupation at the interfacial (Ti0.8Co0.2O 2/Ti0.6Fe0.4O2) layers. Supported by first-principles calculations, the Co3+ state is partially occupied at the interface by superlattice formation, and this new magnetic state directly influences the coupling between Ti0.8Co0.2O2 and Ti0.6Fe0.4O2 nanosheets. These data indicate that the orbital reconstruction is indeed realized by the interface charge transfer between Co and Fe ions in the adjoined nanosheets, and the generic feature of engineered interfaces can be extended to self-assembled superlattices of oxide nanosheets.",

keywords = "ferromagnetic nanosheets, interface ferromagnetism, layer-by-layer assembly, orbital reconstruction, X-ray photoemission spectroscopy",

author = "Minoru Osada and Takayoshi Sasaki and Kanta Ono and Yoshinori Kotani and Shigenori Ueda and Keisuke Kobayashi",

year = "2011",

month = sep,

day = "27",

doi = "10.1021/nn200835v",

language = "English",

volume = "5",

pages = "6871--6879",

journal = "ACS Nano",

issn = "1936-0851",

publisher = "American Chemical Society",

number = "9",

}

TY - JOUR

T1 - Orbital reconstruction and interface ferromagnetism in self-assembled nanosheet superlattices

AU - Osada, Minoru

AU - Sasaki, Takayoshi

AU - Ono, Kanta

AU - Kotani, Yoshinori

AU - Ueda, Shigenori

AU - Kobayashi, Keisuke

PY - 2011/9/27

Y1 - 2011/9/27

N2 - We have investigated the interface electronic states in self-assembled (Ti0.8Co0.2O2/Ti0.6Fe 0.4O2)n superlattices by X-ray photoelectron spectroscopy. A charge of about -0.3 electron is transferred from Fe to Co ions across the interface and induces a major reconstruction of the orbital occupation at the interfacial (Ti0.8Co0.2O 2/Ti0.6Fe0.4O2) layers. Supported by first-principles calculations, the Co3+ state is partially occupied at the interface by superlattice formation, and this new magnetic state directly influences the coupling between Ti0.8Co0.2O2 and Ti0.6Fe0.4O2 nanosheets. These data indicate that the orbital reconstruction is indeed realized by the interface charge transfer between Co and Fe ions in the adjoined nanosheets, and the generic feature of engineered interfaces can be extended to self-assembled superlattices of oxide nanosheets.

AB - We have investigated the interface electronic states in self-assembled (Ti0.8Co0.2O2/Ti0.6Fe 0.4O2)n superlattices by X-ray photoelectron spectroscopy. A charge of about -0.3 electron is transferred from Fe to Co ions across the interface and induces a major reconstruction of the orbital occupation at the interfacial (Ti0.8Co0.2O 2/Ti0.6Fe0.4O2) layers. Supported by first-principles calculations, the Co3+ state is partially occupied at the interface by superlattice formation, and this new magnetic state directly influences the coupling between Ti0.8Co0.2O2 and Ti0.6Fe0.4O2 nanosheets. These data indicate that the orbital reconstruction is indeed realized by the interface charge transfer between Co and Fe ions in the adjoined nanosheets, and the generic feature of engineered interfaces can be extended to self-assembled superlattices of oxide nanosheets.

KW - ferromagnetic nanosheets

KW - interface ferromagnetism

KW - layer-by-layer assembly

KW - orbital reconstruction

KW - X-ray photoemission spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=80053326031&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80053326031&partnerID=8YFLogxK

U2 - 10.1021/nn200835v

DO - 10.1021/nn200835v

M3 - Article

C2 - 21823647

AN - SCOPUS:80053326031

SN - 1936-0851

VL - 5

SP - 6871

EP - 6879

JO - ACS Nano

JF - ACS Nano

IS - 9

ER -

Orbital reconstruction and interface ferromagnetism in self-assembled nanosheet superlattices

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this